According to the report, On-Premises Microsoft Exchange Server deployments still account for the majority of worldwide Exchange mailboxes, however that is changing fast in favor of cloud-based mailboxes. In 2017, On-Premises Microsoft Exchange Server deployments represent 68% of worldwide Exchange Server mailboxes. By the end of 2021, On-Premises Microsoft Exchange Server mailboxes will account for only 33% of mailboxes, due to migration to Microsoft’s Office 365 and other cloud services.

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